eHam.net - Amateur Radio (Ham Radio) Community

Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net


Reviews Categories | Transceivers: VHF/UHF+ Amateur Hand-held | Radioddity GD-77 Dual Band DMR Help


Reviews Summary for Radioddity GD-77 Dual Band DMR
Radioddity GD-77 Dual Band DMR Reviews: 7 Average rating: 3.9/5 MSRP: $86.99
Description: Radioddity GD-77 DMR Dual Band Digital Two Way Radio Dual
Time Slot Compatible with Mototrbo Tier 1&Tier 2
Product is in production.
More info: http://https://www.radioddity.com/radioddity-gd-77-dual-band-dual-time-slot-digital-two-way-radio-walkie-talkie-dmr-compatible-with-motrobo-tier-1-tier-2-programming-cable.html
Email Subscription
You are not subscribed to this review.

Subscribe!
My Subscriptions
Subscriptions Help

You can write your own review of the Radioddity GD-77 Dual Band DMR.

DL4NO Rating: 4/5 Nov 12, 2017 03:25 Send this review to a friend
Nice Entry into the DMR World  Time owned: 0 to 3 months
The GD-77 is largely responsible for the recent DMR hype here in Germany: DMR and FM, 2m and 70cm. Most DMR units are 70cm only and MUCH more expensive.

Usability from the ham perspective is as bad as it is at all DMR units I know. But they are designed for other purposes.

I had the chance to test the most important characteristics with recently calibrated Rohde & Schwarz measuring equipment, with about identical results on 2m and 70cm:

- Squelch opens at 0.12µV
- Output power 4.85 W

I tend the think that the manufacturer has good measuring equipment. Otherwise they would not dare to go that close to the 5 W limit.

The big surprise: The TX signal is clean! The highest spurious transmission is at 1.5 times the 2m signal at -68.5 dB. The required additional 1.5 dB should be filtered by the antenna :-) To measure the 2nd harmonics we had to reduce the spectrum analyzer bandwidth considerably as it was in the -80 db range. The equipment was calibrated up to 6 GHz.

I had given five points if the charging unit would be not as bad as it is:

- The power supply provides 12 V into a USB socket! This is a disaster waiting to happen.

- The switching voltage regulator in the charger is not blocked for RF. I added ceramic capacitors across the regulator chip and across the electrolytic C at the output. Now I can listen while the TRX is in the charger.

- When I keyed the TRX in my hand the charging indicator blinked. Where RF can go in, RF can get out.

- The minus contact of the charger is NOT connected to minus ground. There is a resistor to measure the charging current. I have not evaluated whether this measurement influences the charging current. You should not charge the TRX from your common 13.8 V shack supply AND connect the TRX to a grounded antenna.

I described my modifications at www.dl4no.de/thema/gd-77.htm. The text is in German but the pictures should explain the story.
 
K8PD Rating: 4/5 Sep 30, 2017 20:56 Send this review to a friend
Good Value - Has a Few Rough Spots That Need Refinment  Time owned: 0 to 3 months
The GD-77 is a good value and the build quality is decent (much better than the Baofengs) although not quite in the same league with the MD380/390, CS-580 or professional radios. The charger and programming cable are identical to the TYT MD-380 chargers and you may want to make mod the charger to slightly reduce the final voltage the battery sees when the green light comes on by a couple of 10ths of a volt.

There are a few rough edges and features that the manufacturer seems to be ironing out as they get feedback from early users.

I'm generally happy with this radio but have discovered one issue that needs fixing in a future release of firmware. The "Talk Permit" chirp used to indicate the radio has synced with the repeater time slot is non functional. A chirp happens immediately when the PTT is pushed even if there is no handshake with a repeater. You need to visually observe the display to determine whether you have synced with the repeater.

Other want items would be more than 256 digital contact capability which only makes it useful for talk groups and a small number of private calls. A radio targeted at the amateur market really should have the ability to store at least a statewide or regional database.

That said ... this radio is an amazing value and has good manufacturer support. I have confidence they will work out the glitches in the firmware promptly and that eventually there will be a version that supports a larger contact database. Once that happens, it would rate a 5 with me.
 
AF7CS Rating: 0/5 Sep 29, 2017 09:01 Send this review to a friend
DOA  Time owned: 0 to 3 months
Dead on arrival. No response.
Charger did indicate it was charged.
 
N8PMG Rating: 5/5 Sep 27, 2017 15:08 Send this review to a friend
Very good value  Time owned: 0 to 3 months
The best thing I have seen so far is the firmware and CPS updates that have been released. They show much better support that other cheap DMR choices have had. The radio works as it should, and in the lower tier of DMR is an excellent entry choice. Even better, it is dual band, which the high end professional DMR units don't offer. The long term performance has yet to be tested, but it seems well constructed. It's not a Hytera, but it is better than the other brand ending in ...era, and much more affordable than their dual bander.
 
N6DMR Rating: 5/5 Sep 26, 2017 17:12 Send this review to a friend
Great DMR Radio  Time owned: 0 to 3 months
I bought a pair of these radios from Amazon. They are excellent DMR and analog units and are at a great price point.

As a new DMR user, this was an experience. I had some operator error issues and one email to their Tech Support got me answers in less that 24 hours.

You can program channels from the keypad, it is a slow process though and better to use the traditional CPS software.

There have been some start up issues but the way Radioddity has done updates is amazing. The latest firmware and CPS software is very stable. I expect future updates will make it even better.

Join the Radioddity and Radioddity GD-77 Facebook pages for updates and user forums.
 
AA9EG Rating: 5/5 Sep 12, 2017 15:39 Send this review to a friend
Pleasantly Surprised about quality of radio!  Time owned: 0 to 3 months
I received my GD-77 from Amazon in August. It came in a nice box that contained the radio, charging cube, desktop charging cradle, power cable, 2200mAh battery, dual-band antenna, programming cable and the user manual. The user manual is quite detailed and explains all aspects and features of the radio. The latest version of the programming software can be downloaded from radiodiddity.com website or their Facebook page. Firmware updates can also be downloaded from these sources.

My first impressions of the radio were that it looked well-constructed and felt good in my hand – traits of a “professional” radio. The display is uncluttered and easy to read in all lighting conditions. The display show up well, even in bright sunlight. For darker situations, simply turn on the built-in backlight.

After programming a few DMR repeaters and groups into the radio I was ready to go. I was pleasantly surprised when I heard the first QSO on the radio! The audio was clear and crisp. The volume could be turned up, almost to maximum level, without distorting. This is also a trait of a “professional quality” radio.

After using the GD-77 for a few weeks, my opinions have not changed. This radio is well worth the money it costs. For a price that is less than a single band DMR radio, Radioddity gives you a DUAL band radio. The GD-77 covers UHF DMR as well as the two-meter analog ham band. How many DMR hams have to carry a second HT so they can have the two meter band for ARES and RACES activities? All of the DMR’ers I know do. With Radiodditty GD-77 they can have it all in one radio. I waited until a dual band DMR was available = for that very reason.

From what I have seen on Radioddity’s Facebook page, they are really committed to making this radio the best possible DMR dual band radio. Customers are constantly telling what features they would like to see in the radio and programming software. Radioddity is quick to react to feedback. This is refreshing to find in dealings with ANY company, let alone a Chinese company. Kudos to the people at Radioddity.
 
KC9LOX Rating: 4/5 Aug 2, 2017 19:37 Send this review to a friend
Good 1st production DMR Dual Band  Time owned: 0 to 3 months
This review is for the Radioddity GD-77 2 Slot DMR HT
The radio arrived to my via DHL shipping from overseas. The radio box was covered in a yellow type-shipping envelope. Opening that shows a nicely done box with the typical pictures and radio information. Now time for the surprise of opening the box to find the radio nicely tucked in a clear package bag and same with the antenna, belt clip, battery, and desktop charger. Putting things all together is a SMA male dual band antenna, like Yaesu uses. On attaching the belt clip, I was not impressed with the clip ruggedness. The belt clip bent on me on the 1st day of using. So adding a name brand belt clip in my opinion is recommended. The battery label shows as 7.4V/2200mAh Li-ion. I personally think the battery is not accurate for the size, but the battery does last all day on a charge. The desktop charger is ok made and actually funny, for your Tytera MD-380 users it will charge the GD-77 battery. Therefore, it is almost identically the same as the MD-380 charger.
The exterior of the radio.
The radio itself has a nice construction feel. Granted it is a plastic case, but has comfortable feel to it. The on/off and volume knob is on top solo. There is no channel selector knob available, which I was not a fan of. You have to use the arrow keys on the keypad. The Keypad itself is a three-rowed zero through nine with the zero on the right middle.
On the side of the radio is a single ptt button. No dual switch ptt with this radio. Two programmable buttons are below the PTT which are nicely large for ease of use and one small orange button on top of the radio can be programmed through the software to your liking of choice. The orange top button to me with large fingers is difficult to use as the button is very close to the antenna. Overall, the programmable buttons are a nice touch. On the other side of the radio antenna side the the location for an external speaker mic and programming cable. The radio itself uses the 2-prong Kenwood style speaker mic so that is a nice feature for the multi radio user. Easy interchangeable from one radio to anther for like Tyt, Kenwood, and the Baofeng etc. No special mic needed.
Using the radio
The radio itself does not have a Part 90 or even Part 97 certification label on the radio. So public business radio users you are out of luck. The radio does not have any program on the fly features and all programming is done through software.

Overall this radio is a good purchase for the DMR users. It does have some flaws, but I believe that with some firmware upgrades this radio would make a good dual band option that has both the DMR and analog options.
This review radio was donated by Radioddity for exchange for a test/trial and review purposes.
 


If you have any questions, problems, or suggestions about Reviews, please email your Reviews Manager.